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connection string help please

I am doing a 4.1 install on a w2k3 server with VWD Express 2005 and SQL Express 2005. Every time I build and run my DNN install, I get this error message when going through the install. I believe it is related to the connection string in the web config.
It says the database is read only. I don't know where to change the permissions on the actual db. Can someone help?